From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 27 Aug 2008 15:38:16 -0700 (PDT)

quoted text
> Btw, why is unlocked_ioctl returning "long"? Does anybody depend on that 
> too? That's another difference between the "unlocked" and the traditional 
> version..

The return values want to be "long" sign extended all the way back
down to syscall dispatch, I think this is just an effort to add
some consistency here so that the int --> long extension eventually
can be eliminated once unlocked_ioctl is the only case left.
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